gl/cocoa: Return a strong ref to the parent GstGLContext
If the GstGLCAOpenGLLayer was initialized via a parent context, make sure to ref the context before returning it from getGLContext as all callers will unref it.
Follow up to !3729 (merged)
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
If the GstGLCAOpenGLLayer was initialized via a parent context, make sure to ref the context before returning it from getGLContext as all callers will unref it.
Follow up to !3729 (merged)